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@Federico – of course, that’s the nature of the web. Nothing is perfect and it’s always going to be a matter of weighing up benefits vs pitfalls with this sort of thing.

You could pull a few tricks to lower the chances of a glitch like what you describe, such as onunload, but it’s always going to be a case-by-case scenario. For me, the UX improvements outweigh the potential for visual “breakage”.

That said, the demos in this article were only that; examples. The message behind it all applies to much more than just these few case studies.